Pipe-bending machine



Aug. 28, 1928. 1,682,149

W. E. ROBERTSON PIPE assume uAcHmE Filed July 24, 1926 [0000009 |o|ooo 66916 OQ'OQOOJ INVENTOR.

WEROBERT'SO ATTORNEYS.

Patented Aug. 28, 1928.

UNITED STATES,

PATENT] OFFICE.

WILLIAM E. :aoEER'rsoN, OF BERKELEY, CALIFORNIA. I

PIPE-EENDING MACHINE.

. Application filed July 24, 1926. .Seria1 N' 124,699. 1

' The present invention relates to improvements in pipe bending devices, and its parwhich Figure 1 shows a top plan view of the same,

' pulley and Figure 2 a front view,-and

Figure 3 a sectional view taken along line 33 of Figure 1. a

Figure 4 a I sectional view illustrating a modified form of pipe holding means.

While I have shown only the preferred form of the invention, I wish to have it understood that various changes or modifications may be made within the scope of the claims hereto attached without departing from the spirit of the invention.

My device comprises in its general features two parallel bars 1 and 2 and a transversebar 3' secured relative thereto by means of angle clips 4, or any other suitable manner so that the parallel bars project from the transverse bar in opposite directions by about the same length. The bar 2 .is providedwith a plurality of perforations 6 on opposite sides of the transverse bar, each perforation being adapted to receive a pin 7 on which a grooved pulley 8 is pivoted. Each pin has also pivoted thereto a lever 9 forked as shown at 11. andsupporting between the prongs of the fork, a second pul ley 12 which is also grooved and disposed in such a manner as to co-act with the first to grip a pipe disposed between the same.

To use the pulleys the pipe is inserted endwise between the two sets of pulleys while the two levers are in the parallel position indicated in dotted lines in Figure 1 whereupon the two levers may be turned into the full line position which bends the pipe in the manner shown in the drawing.

It is desirable that an intermediate portion of the pipe be held in a fixed position during this operation and for this purpose I. provide the lever 13pivoted as shown at 14 in two spaced clips 16 and adapted to bear down on an intermediatesection of the pipe 17 which latter is partly accommodated in a groove 18 of a. block19. To hold the. lever 13 inclamping position, a second lever 21 is pivoted as shownat 22 so as toallow the free endof the lever 13 to ride'down- Wardly on the inner faceof the lever 21 and to .be locked in. any desired position means of a series ofv teeth 23 on the lever 21; The second one of the parallelbarsis also provided with a plurality of perforations 24 on opposite sides of the cross bar" and any one of these perforations is adapted to".

receive a stop 26 which may be made of any suitable form, and whichin its preferred form comprises an angular clip 27 fitting pin 28 extending downwardly therefrom adapted to be received in one of the perforations, I The manner of using my device will be readily understood from the foregoing. description. If it is desired to bend a pipe into U shape the two pulleys 8 are first spaced by means of the various perforations in the bar 2, so that their distance corresponds to the length of the base desired. The two levers 9 are swung into parallel position as indicated in dotted linesin Figure 1 and the straight pipe is placed between the two sets of rollers endwise until the de sired position is obtained whereupon an intermediate portion of the pipe is clamped upon the transverse bar by means of the two coacting levers 13 and 21. The two levers 9 are now successively or simultaneously turned on their pivots into the full line position shown in Figure 1, which operation gradually bends the pipe until the ends of the latter engage with the stop 26. The latter may be positioned in such a manner as to allow the pipe to go somewhat beyond the angle desired because the pipe, due to its inherent elasticity will spring back slightly, from its farthest position. Experi ence will show the best position to be selected for the stops for pipe of different sizes and diameters.

In Figure 4 is shown a modified form of pipe holding meansincluding a station ary abutment 31 recessed as shown at 32 to engage the pipe 17 from the outside and a toggle joint 33 for forcing a second abutment 34 against the pipe from the other'sid'e.

The toggle joint includes a link 36 adjustably fastened to the abutment 34 by means of a bolt 37 and a second link 38 pivoted. to a stationary support as shown at 39 and to the link 36 as shown at 41, while a handle 42 extends over the latter pivot for operating the toggle joint.

This manner of holding the pipe 17 engages the latter more directly against the pulley and is in some respects superior to that shown in Figure 3.

I claim: V 1. In a pipe bending device of the character described, two parallel bars a crossbar, means for clamping a pipe tothe cross bar so as to run parallel to theother bars, two pulleys adjustably pivoted on one of the parallel bars on opposite sides of the crossbar so as to accommodate the pipe in grooves thereof,- means for bending the pipe around the pulleys and stops adjustable in the second parallel bar for limiting the turning motion of the pipe. I

2. A device as defined in claim 1 in which the bending means comprise levers pivoted coaxially with the pulleys and pulleys mounted on the same'adapted to coact with the first pulleys in bending the pipe.

3. A pipe bending machine comprising two parallel bars, a. cross bar, means on said I cross bar for clamping a pipe thereto so as to lie parallel to the arallel bars, a pair of pulleys adjustably plvoted on one of said 7 parallel bars, said pulleys bearing against said pipe, means for bending said pipe around said pulleys and stops adjustable in one of said parallel bars for limiting the turning movement of the pipe.

pipe around the pulleys, and stops adjustable in one of said parallel bars for limiting the turning movement of the pipe;

5. A pipe bending machine comprising a pairofparallel bars, a cross bar, means for clamping the pipe to the cross bar so" to run parallel to the other bars, a pair of pulleys adjustably pivoted on one of the parallel bars on opposite sides of the cross bar, there being grooves in said pulleys to accommodate said pipe, a pair of handles prising means for bending the pipe around the pulleys, as and for the purpose specified. 6. A devlce as claimed 111 Cl L1l11 5 and, in

addition, stops adjustable in one of said par; allel bars for limiting the turning movement of the pipe.

In testimony whereof I affix my signature.

WILLIAM'E. noenn'r'son,

attached to said pulleys, said handles com-' 

